Derivatives and Hedge Accounting Activities (Schedule of Derivatives not Designated as Hedging Instruments) (Details) (Fair Value - Derivatives not under Hedge Accounting, USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 21	[1]	$ (7)	[1]	$ 90	[1]	$ 8	[1]
Interest Rate Contract
Amount of Gain (Loss) Recognized in Income on Derivatives	10	[1],[2]	(4)	[1],[2]
Commodity Contract | Operating revenue
Amount of Gain (Loss) Recognized in Income on Derivatives	5	[1]	15	[1]	108	[1]	56	[1]
Commodity Contract | Purchased Gas
Amount of Gain (Loss) Recognized in Income on Derivatives	3	[1]	(10)	[1]	(2)	[1]	(28)	[1]
Commodity Contract | Electric fuel and other energy related purchases
Amount of Gain (Loss) Recognized in Income on Derivatives	3	[1]	(8)	[1]	(33)	[1]	(16)	[1]
Interest Rate Contract | Interest Rate Contract
Amount of Gain (Loss) Recognized in Income on Derivatives					17	[1],[2]	(4)	[1],[2]
Virginia Electric and Power Company
Amount of Gain (Loss) Recognized in Income on Derivatives	4	[3]	(12)	[3]	(43)	[3]	(20)	[3]
Virginia Electric and Power Company | Interest Rate Contract
Amount of Gain (Loss) Recognized in Income on Derivatives	1	[3],[4]	(4)	[3],[4]	0	[3],[4]	(4)	[3],[4]
Virginia Electric and Power Company | Commodity Contract
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 3	[3],[5]	$ (8)	[3],[5]	$ (43)	[3],[5]	$ (16)	[3],[5]

[1] Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion’s Consolidated Statements of Income.

[2] Amounts recorded in Dominion’s Consolidated Statements of Income are classified in interest and related charges.

[3] Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income.

[4] Amounts are recorded in interest and related charges in Virginia Power’s Consolidated Statements of Income.

[5] Amounts are recorded in electric fuel and other energy-related purchases in Virginia Power’s Consolidated Statements of Income.